On Thu, Jan 18, 2007 at 06:14:31PM +0200, Michael S. Tsirkin wrote:
> So the issue is that we are casting char *data which has no
> alignment guarantees to 64 bit number. We really must find a way to
> force 64 bit alignment for struct ib_user_mad all over. Would not
> something like the following simple trick work?
> struct ib_user_mad_hdr {
> .............
> } __attribute__((aligned (8)));
You might get a similar result if you change:
struct ib_user_mad {
struct ib_user_mad_hdr hdr;
__u8 data[0];
};
To
struct ib_user_mad {
struct ib_user_mad_hdr hdr;
__u64 data[0];
};
Which is more clear since it is the data[0] that has the alignment
requirement not the ib_usr_mad_hdr.. Plus you only get the pad if you
actually need it.
Jason
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